Effect of Annealing on Gas Sensing Performance of Nanostructured Zno Thick Film Resistors

Shinde, S. D.; Patil, Ganesh C.; Kajale, D. D.; Wagh, V. G.; Gaikwad, V. B.; Jain, G. H.

doi:10.21307/ijssis-2017-481

Cited by 11 publications

(10 citation statements)

References 20 publications

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“…Then, it can be deduced that the increase of sensitivity observed for the ZnO NPs sample annealed at the higher temperature tested should be attributed to other factors than the increase of surface area. It is well known that the crystallinity systematically increase with the increase of annealing temperature, as well as the formation of a greater number of oxygen vacancies [ 22 ]. These factors then could explain the increased ZnO sensor sensitivity for CO at higher annealing temperature.…”

Section: Resultsmentioning

confidence: 99%

CO and NO2 Selective Monitoring by ZnO-Based Sensors

et al. 2013

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ZnO nanomaterials with different shapes were synthesized, characterized and tested in the selective monitoring of low concentration of CO and NO2 in air. ZnO nanoparticles (NPs) and nanofibers (NFs) were synthesized by a modified sol-gel method in supercritical conditions and electrospinning technique, respectively. CO and NO2 sensing tests have demonstrated that the annealing temperature and shape of zinc oxide nanomaterials are the key factors in modulating the electrical and sensing properties. Specifically, ZnO NPs annealed at high temperature (700 °C) have been found sensitive to CO, while they displayed negligible response to NO2. The opposite behavior has been registered for the one-dimensional ZnO NFs annealed at medium temperature (400 °C). Due to their adaptable sensitivity/selectivity characteristics, the developed sensors show promising applications in dual air quality control systems for closed ambient such as automotive cabin, parking garage and tunnels.

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Section: Resultsmentioning

confidence: 99%

CO and NO2 Selective Monitoring by ZnO-Based Sensors

et al. 2013

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“…Greater the number of such defects better is the gas sensing response. However, a very high annealing temperature causes the agglomeration of the particles, resulting in increased crystallite size and reduced specific surface which in turn retards the gas response [ 93 , 94 ].…”

Section: Factors Influencing Gas Sensing Propertiesmentioning

confidence: 99%

Zinc Oxide Nanostructures for NO2 Gas–Sensor Applications: A Review

Kumar¹,

Aldossary

Kumar³

et al. 2014

Nano-Micro Lett.

717

290

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Because of the interesting and multifunctional properties, recently, ZnO nanostructures are considered as excellent material for fabrication of highly sensitive and selective gas sensors. Thus, ZnO nanomaterials are widely used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. The presented review article is focusing on the recent developments of NO2 gas sensors based on ZnO nanomaterials. The review presents the general introduction of some metal oxide nanomaterials for gas sensing application and finally focusing on the structure of ZnO and its gas sensing mechanisms. Basic gas sensing characteristics such as gas response, response time, recovery time, selectivity, detection limit, stability and recyclability, etc are also discussed in this article. Further, the utilization of various ZnO nanomaterials such as nanorods, nanowires, nano-micro flowers, quantum dots, thin films and nanosheets, etc for the fabrication of NO2 gas sensors are also presented. Moreover, various factors such as NO2 concentrations, annealing temperature, ZnO morphologies and particle sizes, relative humidity, operating temperatures which are affecting the NO2 gas sensing properties are discussed in this review. Finally, the review article is concluded and future directions are presented.

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“…Recently, different ZnO morphologies, such as rods, owers, spheres, disks, and hexagonal columns, have been synthesised using different methods, as displayed in Table 4. 2,5,11,16,27,46,68,[83][84][85][86][87][88][89][90][91][92][93][94][95][96] Various methods can be used to obtain ZnO crystal structures; however, the hydrothermal approach from aqueous solutions offers advantages, such as the low processing temperature and the use of simple material, its appropriateness for large-scale application and economic advantages. 83…”

Section: Fe-sem Analysesmentioning

confidence: 99%

“…92 This process is considered simple and innovative. 87 The crystal formation process includes nucleation and growth. Initially, because of the decomposition of ZAD at high temperature, the concentrations of Zn 2+ and OH À increase correspondingly.…”

Section: Growth Processmentioning

confidence: 99%